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Adhesive Sheet and a Release Liner

a technology of adhesive sheets and release lines, applied in the field of adhesive sheets, can solve the problems of affecting the adhesion of an article, and deteriorating the appearance of adhesive sheets, and achieves good adhesion force, good appearance, and good appearance

Active Publication Date: 2007-12-20
RIKEN TECHNOS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0043] The adhesive sheet of the present invention comprises a resin film and an adhesive layer on one side thereof, wherein there is no difference in shrinkage rate between the resin film and the release liner and, therefore, a good appearance is maintained after stored with release liner thereon for a prolonged time, and the adhesive sheet has a good appearance and a good adhesion force when it is applied to an article.
[0044] The release liner of the present invention has embosses on its surface and, therefore, the release liner is useful as a release liner for an adhesive sheet having grooves on a surface of an adhesive layer. The release liner of the present invention is also good in smoothness and, therefore, it is useful, in particular, as a release liner for a high gloss adhesive sheet whose surface opposite to the adhesive layer is a mirror-like surface and has high gloss.

Problems solved by technology

These problematic phenomena deteriorate the appearance of the adhesive sheet.
Another problem is that when an adhesive sheet is applied on an article, air tends to remain between the adhesive layer of the adhesive sheet and the article, which also deteriorates the appearance of the adhesive sheet or impairs adhesion to an article.
However, the aforesaid deterioration of appearance caused by shrinkage of the resin film, which occurs when the adhesive sheet is stored together with a release liner thereon, still remains unsolved.
This change in the shape of the grooves and the flow of the adhesive agent near the grooves affect the appearance of the resin film which is located on the side opposite to the grooves of the adhesive layer, so that a crater-like pattern appears on the surface of the adhesive sheet as if the adhesive sheet is embossed, which significantly deteriorates the appearance of the adhesive sheet after applied.
Paper surface tends to be unlevel.
However, even when a polyolefin resin is laminated with paper, it is difficult to completely eliminate the concavity and convexity of paper.
Accordingly, when a release liner with a paper substrate is applied to an adhesive sheet, the concavity and convexity on the release liner surface are transferred to the adhesive layer of the adhesive sheet, so that the adhesive sheet has a drawback that concavo-convex pattern appears on the surface of the adhesive sheet opposite to the side which is in contact with the release liner, when the adhesive sheet is applied to an article.
Particularly, in a case of high gloss adhesive sheet which has a mirror-like surface with high gloss, such concavo-convex pattern on the surface deteriorate the mirror-like property and, therefore, such a release liner is unsuitable.
This liner is suitable for use in adhesive sheets having grooves on the surface of the adhesive layer, but unsuitable for such a high gloss adhesive sheet that has a mirror-like surface with high gloss because concavo-convex pattern caused by paper still remains on the liner surface even when embossing finish is provided.
However, the above-mentioned drawn resin film is less suitable for embossing and, therefore, may not be embossed.
For instance, a drawn PET has a high melting point of 258 degrees C. and, therefore, it is difficult to supply enough heat to PET to soften it for embossing with a heat roll or the like.
If OPP is heated around a melting point, the heating causes significant shrinkage and, therefore, it may not be used as a release liner any more.

Method used

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  • Adhesive Sheet and a Release Liner
  • Adhesive Sheet and a Release Liner
  • Adhesive Sheet and a Release Liner

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0125] An embossing press panel engraved with cross-shaped Grooves 4 at intervals of 200 micrometers (i.e. a density of 2.5×103 / cm2) as shown in FIG. 2, where Grooves 4 were not open at the side surface, each groove had a U-shaped cross-section with a width of 20 micrometers and a depth of 10 micrometers and the cross was 100 micrometers wide and 100 micrometers long, was pressed to release paper at a temperature of 140 degrees C. for 20 seconds, so that the emboss shape was transferred to the release paper to obtain Release Liner 1 which had a male surface structure.

[0126] Then an acrylic adhesive, a curing agent, and toluene and ethyl acetate as a solvent were combined in a ratio by weight of 1000:6:100:100 and mixed well at room temperature for 2 minutes. The resulting mixture was applied on Release Liner 1 and dried at 100 degrees C. for 2 minutes to obtain an adhesive layer with a thickness of 30 micrometers. Subsequently the adhesive layer was laminated with a PVC resin film ...

example 2

[0128] An embossing press panel engraved with hexagonal Grooves 4 at intervals of 400 micrometers (i.e. a density of 7.2×102 / cm2) as shown in FIG. 5, where Grooves 4 were not open at the side surfaces, each groove had a U-shaped cross-section with a width of 30 micrometers and a depth of 15 micrometers and a side of the hexagon was 116 micrometers long, was pressed against a release liner at a temperature of 140 degrees C. for 20 seconds, so that the emboss shape was transferred to release paper to obtain Release Liner 2 which had a male surface structure. Using this release liner, Adhesive Sheet B with a release liner was obtained according to the same procedures as Example 1.

example 3

[0129] embossing press panel engraved with cross-shaped Grooves 4 at intervals of 100 micrometers (i.e. a density of 1.0×104 / cm2) as shown in FIG. 2, where Grooves 4 were not open at the side surface, each groove had a U-shaped cross-section with a width of 20 micrometers and a depth of 10 micrometers and the cross was 50 micrometers wide and 50 micrometers long, was pressed to release paper at a temperature of 140 degrees C. for 20 seconds, so that the emboss shape was transferred to the release paper to obtain Release Liner 3 which had a male surface structure. Using this release liner, Adhesive Sheet C with a release liner was obtained according to the same procedures as Example 1.

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Abstract

The present invention provides an adhesive sheet comprising a resin film and an adhesive layer adhering to one side of said resin film, wherein the adhesive sheet does not cause significant shrinkage when it is stored together with a release liner thereon for a prolonged time. The adhesive sheet of the present invention is an adhesive sheet comprising a resin film and an adhesive layer adhering to one side of said resin film, characterized in that said adhesive layer has one or more grooves on a side opposite to a side on which said adhesive layer adheres to said resin film, and said groove or grooves exist only in an inner area of said opposite side of said adhesive layer and are not open at side surfaces of said adhesive layer. The present invention also provides a release liner for an adhesive sheet having embosses on its surface and being good in smoothness.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an adhesive sheet comprising an adhesive layer on one side of a resin film, particularly, to an adhesive sheet wherein the resin film does not cause significant shrinkage when it is stored together with a release liner thereon for a prolonged time. The present invention relates also to a release liner. In particular, the present invention relates to a release liner for an adhesive sheet, having embosses and being excellent in terms of smoothness. The present invention relates further to an adhesive sheet with a release liner, comprising the aforementioned adhesive sheet and the aforementioned release liner. BACKGROUND OF THE INVENTION [0002] An adhesive sheet comprising an adhesive layer on one side of a resin film is covered with a release liner and stored. Generally, a release liner which is composed of paper or an drawn resin film such as drawn PET or OPP has a shrinkage rate of from about 0 to 0.2% when it is stored ...

Claims

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Application Information

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IPC IPC(8): B32B33/00B32B7/02B32B7/12C09J7/38
CPCC09J7/0207C09J7/0232C09J2201/28Y10T428/1476Y10T428/24975Y10T428/265Y10T428/28Y10T428/14Y10T428/1486C09J7/38C09J7/403C09J2301/204C09J7/20
Inventor SUZUKI, YASUHIRO
Owner RIKEN TECHNOS CORP